rcu: Move rcu_ftrace_dump() from rcupdate.h to rcu.h

The rcu_ftrace_dump() function is used only internally to RCU.  This
commit therefore moves its declaration from include/linux/rcupdate.h
to kernel/rcu/rcu.h.
Reported-by: NIngo Molnar <mingo@kernel.org>
Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>

include/linux/rcupdate.h

@@ -883,18 +883,6 @@ static inline void rcu_sysidle_force_exit(void) { }
 #endif /* #else #ifdef CONFIG_NO_HZ_FULL_SYSIDLE */
 
 
-/*
- * Dump the ftrace buffer, but only one time per callsite per boot.
- */
-#define rcu_ftrace_dump(oops_dump_mode) \
-do { \
-	static atomic_t ___rfd_beenhere = ATOMIC_INIT(0); \
-	\
-	if (!atomic_read(&___rfd_beenhere) && \
-	    !atomic_xchg(&___rfd_beenhere, 1)) \
-		ftrace_dump(oops_dump_mode); \
-} while (0)
-
 /*
  * Place this after a lock-acquisition primitive to guarantee that
  * an UNLOCK+LOCK pair acts as a full barrier.  This guarantee applies

kernel/rcu/rcu.h

@@ -212,6 +212,18 @@ int rcu_jiffies_till_stall_check(void);
  */
 #define TPS(x)  tracepoint_string(x)
 
+/*
+ * Dump the ftrace buffer, but only one time per callsite per boot.
+ */
+#define rcu_ftrace_dump(oops_dump_mode) \
+do { \
+	static atomic_t ___rfd_beenhere = ATOMIC_INIT(0); \
+	\
+	if (!atomic_read(&___rfd_beenhere) && \
+	    !atomic_xchg(&___rfd_beenhere, 1)) \
+		ftrace_dump(oops_dump_mode); \
+} while (0)
+
 void rcu_early_boot_tests(void);
 void rcu_test_sync_prims(void);